Added modern node versions to travis ci

.travis.yml

@@ -1,3 +1,30 @@
+sudo: false
+
 language: node_js
+
 node_js:
-  - "0.10"
+  - "4"
+  - "5"
+  - "6"
+
+cache:
+  directories:
+    - node_modules
+
+install:
+  - npm install
+
+script:
+  - npm run test
+
+# Necessary to compile native modules for io.js v3 or Node.js v4
+env:
+  - CXX=g++-4.8
+
+# Necessary to compile native modules for io.js v3 or Node.js v4
+addons:
+  apt:
+    sources:
+      - ubuntu-toolchain-r-test
+    packages:
+      - g++-4.8